Tipping at Strip Club?

Do you guys tip at strip clubs? I've frequented many strip clubs in my life but I still dont know what the proper etiquette is... Lets say you get a simple private dance for $50, do you give them $60? Is it just like a restaurant where you tip only if its good?

I'm sure they'd appreciate any money you can spare for them. They'll let you know just how much they appreciate it, too.

"People assume that time is a strict progression of cause to effect, but *actually* from a non-linear, non-subjective viewpoint - it's more like a big ball of wibbly wobbly... time-y wimey... stuff." -- The Doctor